This! Beef Tenderloin French Dip with Homemade IS DELICIOUS! Remember that beef tenderloin from the other day? Well, we had leftovers, and when you have leftovers of a filet of beef you make sandwiches. In this case, French dip with homemade au jus! So good!!!! We love a sandwich like this especially you can dip it in some yummy beef broth.